PACLEN

Command

PACLEN -- Display / Set global or port paclen values.

Synopsis

PA[clen] <port | 0> [value]

Description

The PACLEN command allows the global and port-specific PACLEN settings to be displayed and changed. Paclen is the maximum data field length within an AX25 or Netrom packet.

The global PACLEN is specified (using PACLEN=n) in the L2 global parameters section of the XROUTER.CFG file, and is the default value, used where not overriden by a port-specific paclen.

All frames originating at the router use the global or port paclens specified, but Netrom frames originating at other systems can not be fragmented, so we have no control over them, and they may be larger than our paclen.

If the port PACLEN is set to 0, XRPi dynamicallys adapts PACLEN (and MAXFRAME) to the link conditions, to maximise throughput.

Options

If a single numeric argument is supplied, and it is a valid port number, the current paclen for that port number is displayed.

If two numeric arguments are supplied, the first specifies a port number and the second specifies a new paclen value for that port.

If the first argument is zero, the PACLEN command displays and sets the global paclen.

Examples

PACLEN 0         - Display global default paclen
PACLEN 0 120     - Set default paclen to 120
PACLEN 10        - Display current paclen for port 10
PACLEN 10 160    - Set port 10 paclen to 160

Availability

This command is sysop-only.